added android client

android/app/proguard-rules.pro

@@ -0,0 +1,9 @@
+-keep class uniffi.pstr_android.** { *; }
+# rustls-platform-verifier loads these classes from Rust through JNI, so R8
+# cannot infer that they are reachable from the Kotlin call graph.
+-keep class org.rustls.platformverifier.** { *; }
+-keep class com.sun.jna.** { *; }
+-dontwarn com.sun.jna.**
+-keepclasseswithmembernames class * {
+    native <methods>;
+}